Why Algae Grows in Swimming Pools (And How to Prevent It)

Few things are more frustrating for pool owners than walking outside and discovering their pool water has turned green and cloudy. In most cases, the culprit is algae. Algae are tiny plant-like organisms that thrive in warm water, sunlight, and poorly balanced pool chemistry.

Why Algae Appears in Pools

Algae spores are constantly entering pools through wind, rain, dust, leaves, and even swimmers. When sanitizer levels drop or water circulation is poor, these spores can quickly grow and spread throughout the pool.

Common causes of algae include:

• Low chlorine levels

• Poor water circulation

• Dirty or clogged filters

• Warm temperatures and sunlight

• Debris such as leaves and pollen in the water

Once algae begins to grow, it can quickly turn the water green, cloudy, or even slimy along pool surfaces.

How to Prevent Algae

Preventing algae is much easier than trying to remove it once it has taken hold. Regular pool maintenance and proper chemical balance are the key to keeping algae from forming.

Helpful prevention steps include:

• Maintaining proper chlorine levels

• Brushing pool walls and steps regularly

• Keeping the filter system clean

• Running the pool pump long enough each day for proper circulation

• Removing leaves and debris promptly

Professional Pool Maintenance Helps

Consistent weekly pool service helps ensure water chemistry stays balanced and equipment is functioning properly. Routine maintenance prevents algae growth before it becomes a major problem.

For homeowners in Upland, Claremont, and La Verne, regular professional care can keep pools clean, clear, and ready to enjoy all year long.

With proper care and maintenance, algae never has a chance to take over your pool. 💧